Disclosed is a unidirectional clutch wheel assembly that includes a first wheel, a second wheel coaxial with the first wheel and including an inner toothing, a rigid drive member rotationally fixed with respect to the first wheel and at least one rigid pawl connected to the rigid drive member by an elastic strip. The rigid pawl is locked against the inner toothing by the rigid drive member to rotationally fix the first and second wheels to each other when the first wheel or the second wheel is rotationally driven in a direction corresponding to coupling. The inner toothing has asymmetrical teeth. The rigid pawl is arranged, in its position locked against the inner toothing, to be in point contact, in top plan view, with two consecutive teeth of the inner toothing and with the rigid drive member.

Jumper device (80) for a timepiece device (100) including at east one first arm (81) including a first beak (81a) for positioning a first mobile unit (10), at least one second arm (82) including a second beak (82a) for positioning a second mobile unit (20), an elastic element (84) for returning the first arm and the second arm to configurations positioning the first and second mobile units, and a lever (83; 83) interfaced between, on the one hand, the elastic return element, and on the other hand, the first and second arms.

The present invention improves the weathering performance of a stopper structure preventing inadvertent rotation or a rotated body accommodated in a case. An operation member having a head portion rotated outside the case and a shaft portion inserted into a pipe so as to be movable between a first position and a second position that is outer than the first position. A stopper structure is provided inside the case to prevent rotation of the head portion when the operation member is positioned at the second position, whereas the stopper structure allows rotation of the head portion when the operation member is positioned at the first position.

The present invention improves the weathering performance of a stopper structure preventing inadvertent rotation or a rotated body accommodated in a case. An operation member having a head portion rotated outside the case and a shaft portion inserted into a pipe so as to be movable between a first position and a second position that is outer than the first position. A stopper structure is provided inside the case to prevent rotation of the head portion when the operation member is positioned at the second position, whereas the stopper structure allows rotation of the head portion when the operation member is positioned at the first position.

A mechanism (1) including a magnetic gear (2) including a first wheel (6B) and a second wheel (6C) provided with a first magnetic toothing (10) and a second magnetic toothing (12) respectively. The first and second magnetic toothings are respectively formed by first and second teeth made of a soft ferromagnetic material; and the magnetic gear (2) further includes a third wheel (6A) arranged between the first and second wheels (6B, 6C) and provided with a third magnetic toothing (8) formed by permanent magnetic poles, in particular by bipolar magnets. In general, the first wheel is a drive wheel, whereas the second wheel is driven into order to carry out a function or transmit a torque. The third intermediate wheel is preferably mounted such that it can rotate freely.